Hartberg was noticed as early as 15–16 years old as a bass player on the jazz scene connected to «Oslo jazzhus» in
Toftesgate. Here he played in several bands, including «For Sure» with
Sjur Miljeteig, and «Gest» with
Tord Gustavsen. He established «Klovner i Kamp» in 1994 together with Sveinung Eide. The same year he was part of establishing the band «Oslo Fluid». In sum, these bands let out seven albums, in addition to a plethora of singles and EP's. In 1995, he was also involved in «Pimp image», Norwegian pop band inspired by acid-jazz wave, which was signed to
Virgin Records. In 1999 he was part of starting the label «City Connections» which was an important contributor to the Norwegian hip-hop community. Besides «Klovner i Kamp» and «Oslo Fluid», they released records with «Salvador», «Malay Sparks» and «Mojo and He-man». In this period Hartberg also had success as a jazz musician. At 20y he replaced bassist
Bjørn Kjellemyr in
Halle/
Eberson Quartet and at the end of the 1990s he started the band
Shining together with
Jørgen Munkeby,
Morten Qvenild and
Torstein Lofthus, fellow students at
Norges Musikkhøgskole. Gruppen utga tre plater og turnerte i hele verden før Hartberg sluttet i 2005. He also was awarded «Alarmprisen» twice with the band Shining. Hartberg and
Esben Selvig was in 2002 awarded
Edvard Prize in the class Text to music, within the band Klovner i Kamp tune «Nattens sønner». The group's lyrics can be found in half a dozen Norwegian text books, poetry collections and anthologies. == Honors ==